error in 'isempty(x)' when x is in the class of dataset

Hi,

I have problems using function isempty(x) when x is in the class of dataset. For example,

>> x=randn(100,10); >> xx=dataset(x); >> isempty(xx) ??? Reference to non-existent field 'nobs'.

Error in ==> dataset.isempty at 11 t = (a.nobs == 0) (a.nvars == 0);

I think this is because when I use 'dataset', only certain fields are created, which does not include the field 'nobs'. When isempty.m tries to locate this field, the error occurs. However, I am not sure how to solve this problem. Can anyone help me with this please?

Thanks in advance.

[Thomas]

Works fine for me: What version of MATLAB are you using?

x=randn(100,10);
xx=dataset(x);

>> isempty(xx)
ans =
     0

[Xiu]

I am using MATLAB 2010a

[Thomas]

I cannot test on R2010a but I can assure you it works from R2010b Sp1 onwards.. What OS are you on? Windows, Linux ,OSX?

[Xiu]

I am using Windows.

[Matt Tearle]

I just tried it on 10a and it worked fine. The error seems to indicate that it doesn't recognize the nobs property. But it's using the dataset version of isempty, so it should... Very odd. Something messed up in your installation, perhaps?

Just as a sanity check, try

>> which dataset(x)

and

>> which isempty(xx)

[Sean de Wolski]

Not reproducing for me on 12a:

   x=randn(100,10);
 xx=dataset(x); 
 isempty(xx)

[Xiu]

I have figured the problem. I have additional toolbox in my matlab which contains another dataset.m file. Once I removed it, it is working perfectly fine. Thanks for all your helps.

[Sean de Wolski]

Excellent!

Xiu, please write your comment as an answer and accept it to mark this question closed!

Answer 1

[Xiu]

I have figured out this problem. I have additional toolbox installed which overlaps the function dataset. Once I have it removed, everything is working fine.